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Re: Error: Sys.ScriptLoadFailedException:

jonathanparker

Maybe check that all references to javascript in the HTML source return valid javascript.

It also may be that one of the scripts isn't registering properly.

I think you may need to register at the bottom of your custom javascript files (if you have any)

that the script has loaded.

Like this:

if( Sys && Sys.Application ){
Sys.Application.notifyScriptLoaded();
}

I was having the same issue when using Infragistics web edit controls within a MultiView control all wrapped within an UpdatePanel. I added this JavaScript code at the bottom of each of the Infragistics' js files and it started working perfectly after that.
Thanks!